# EPUBCheck OPF-017: The attribute full-path on element…

Source: https://epublab.com/epubcheck/opf-017/ (updated 2026-11-03)

EPUBCheck OPF-017 is an error message: “The attribute "full-path" on element "rootfile" must not be empty.” A rootfile element in META-INF/container.xml has an empty full-path attribute.

- Official message (EPUBCheck 5.4.0): The attribute "full-path" on element "rootfile" must not be empty.
- Default severity: Error

## Typical causes

- A template container.xml whose path was never filled in.

## How to fix it

- Write the package document's path from the root of the archive, for example full-path="OEBPS/content.opf".

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.